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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2731) HBase won't start due to NodeExistsException in Zookeeper-based region assignment
Date Tue, 15 Jun 2010 16:49:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879023#action_12879023
] 

Jonathan Gray commented on HBASE-2731:
--------------------------------------

@Cosmin, can you post full logs?  We've been doing cluster tests here so it does work in our
environment.  Actually I wonder if we've tested cluster restart sufficiently...

> HBase won't start due to NodeExistsException in Zookeeper-based region assignment
> ---------------------------------------------------------------------------------
>
>                 Key: HBASE-2731
>                 URL: https://issues.apache.org/jira/browse/HBASE-2731
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.21.0
>            Reporter: Cosmin Lehene
>            Priority: Blocker
>             Fix For: 0.21.0
>
>
> We're getting zillions of these in HMaster when it starts assigning regions at startup
and it doesn't seem to progress.
> {code}
> 2010-06-15 06:30:00,287 WARN org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: 
> <org.apache.hadoop.hbase.master.HMaster>Failed to create ZNode /hbase/UNASSIGNED/1766164500
in ZooKeeper^D
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists
for /hbase/UNASSIGNED/1766164500^D
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:110)^D
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)^D
>         at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:637)^D
>         at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.createZNodeIfNotExists(ZooKeeperWrapper.java:974)^D
>         at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.createUnassignedRegion(ZooKeeperWrapper.java:1053)^D
>         at org.apache.hadoop.hbase.master.RegionManager.doRegionAssignment(RegionManager.java:355)^D
>         at org.apache.hadoop.hbase.master.RegionManager.assignRegions(RegionManager.java:312)^D
>         at org.apache.hadoop.hbase.master.RegionManager.assignRegionsToMultipleServers(RegionManager.java:292)^D
>         at org.apache.hadoop.hbase.master.RegionManager.assignRegions(RegionManager.java:221)^D
>         at org.apache.hadoop.hbase.master.ServerManager.processMsgs(ServerManager.java:500)^D
>         at org.apache.hadoop.hbase.master.ServerManager.processRegionServerAllsWell(ServerManager.java:425)^D
>         at org.apache.hadoop.hbase.master.ServerManager.regionServerReport(ServerManager.java:335)^D
>         at org.apache.hadoop.hbase.master.HMaster.regionServerReport(HMaster.java:700)^D
>         at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)^D
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)^D
>         at java.lang.reflect.Method.invoke(Method.java:597)^D
>         at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:576)^D
>         at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:919)
> {code}

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